Specifics such as square footage, lot size, condition of the house, etc.  

Size is not really a concern.  

cool thats good to hear, however the other side of the story thats not really talked about by lenders is that if you have a lot of other properties in the area you are trying to buy a property "in" then it may be very difficult to purchase an eleventh financed property as a primary residence unless it makes sense for your given scenario.Often times this requires:- a Great LOE - letter of explanation- supporting documentation like relocation letters from employers, LOE's from family members, spouses, marriage certificates, mammograms (show increased family size), etc etc list goes on- your  track record with other properties, like did you buy them as a primary then switch to investment properties (underwriters test to see your past "integrity," with mortgage transactions).

There are a lot of similar sized 3 bed with 2 bath comps in the area selling for around $270K, but not any 3/1s - most flippers are finishing basement and adding second bath.

I use $1,000 per unit for maintenance and up to $1,000 for capital expenses depending on size of building.Bill

Market for the same size in my neighborhood is around $650-750, but I charge $900-1000.

Should all units be the same size or should they be different?

From all the podcasts and all the reading I have done here, I just dont see how people are truly cashing in as small to mid size REIs. $100/door would put me at 30 units a month just to cover my bills.

With a good size family to support I'm going to have to start small and smart.

Eventually, I would like to have a substantial RE portfolio specializing in small to medium size apartments in urban areas and more specifically surrounding prominent universities.